Just got back from the Rio. For Diamonds under 25K TC, they charge for admission to the Diamond lounge the first visit of the day but did not charge me if I went back again later. They were unsure if I'd be charged admission to other Diamond Lounges and sent me to the TR desk. TR desk said each lounge would charge me the 1K for admission. They also said they were not able to see what happened at other lounges so I guess that makes sense that I'd get a fresh charge.

I didn't really notice any improvement of the food offerings from last year when entry was free and it really didn't seem to improve the overcrowding (at least at Rio)